Stop-watch.



PATENTED MAY 10, 1904.

J. L. NEWELL.

STOP WATCH.

APPLIOATION'I'ILBD APR. 27. 1903.

III I Patented May 10, 1904.

UNITED STATES PATENT OFFICE.

JAMES L.. NEWELL, OF SAGINAW, MICHIGAN.

STOP-WATCH.

SPECIFICATION forming part of LettersiPatent No. 759,303, dated May 10,1904.

Application filed April 27, 1903.

T 0 all whom it nut/y concern.-

Be it known that I,- JAMES L. NEWELL, a citizen of the United States,residing at Saginaw, in the county of Saginaw and State of Michigan,have invented a new and useful Improvement in Stop-Watches orHorse-Timers, of which the following is a specification.

The object of my invention is to provide a simple, inexpensive, andaccurate stop-watch;

The invention consists in the novel construction and combination of theseveral parts, whereby the sweep seconds-hand may be returned to zero orits starting-point without the use of clutches ordisengaging any of thetrain of wheels, as will hereinafter be fully set forth, and pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a plan view of my improved stopwatch, showing the back sideof the front plate, the back plate being removed with the standard trainof a watchmovement shown in broken lines and my improvements in solidlines. Fig. 2 is a side view of the spring 6. Fig. 3 is a side view,partly sectional, of the sweep seconds-post and bearings. Fig. 4 is aplan view of sweep seconds-post, showing heart-cam k, friction-cap 7L,and gear-wheel g.

a is the front plate of my improved watch, having the long centralbearing 6, through which the post 0 of the sweep seconds-hand (1projects. The bottom of the post 0 is enlarged to form the bearing 6,which rides upon the mainspring-barrel f, thereby retaining the sweepseconds-post in its bearing 6.

g is a gear-wheel revolubly connected to the sweep seconds-post 0 by thefriction-caps It and '5.

k is a heart-cam common to stop-watches, which is secured to post 0 by adriving fit, so as to bear upon the friction-cap la, and impose asuitable pressure thereon.

Meshing with the gear-wheel g is a gearwheel Z, which is secured to thearbor of the fourth wheel of any standard American watchmovement, whichIprefer to arrange as shown in Fig. 1 by broken lines.

Fulcrumed to the front plate a at 9% is a lever Serial Nd. 154,592. (Nomodel.)

A 0, withthe arms 12 and g at one end and the other end forming an arm0*, extending through and terminating in a button 1* on the outside ofthe plate a, by means of which lever 0 is operated.

tis a spring secured by one end it to the front plate a for holding thearm 7, by which the lever 0 is held in its position. Near the middle ofthe spring 25 is a corrugation forming the inclined shoulder t on thefree side and with the fixed end in the notch t" on the other side.

4) is a light spring secured to the front plate a and bearing againstthe lever 0, so as to always return and hold the arm 1 against theshoulder t of spring 6, but not strong enough to force it past the same.

The arm 19 of lever 0 terminates in a point p and is adapted to engagethe heart-cam k in order to return the sweep-hand d to zero. The arm qterminates in a fine spring end q, having the guide g at its end. Theend (1 is proportioned and so formed as to engage a balance-wheel arbors of the watch-movement, and thereby stops same while the lever 0 is inthe position as shown in Fig. 1, and while the arm 10 engages theheart-cam.

The operation is as follows: To time the speed of anything, the firstoperation is to place the sweep seconds-hand d to its position at zero,which is done by the operatorpressing the button r of the lever 0 in thedirection of the arrow, Fig. 1, causing the point p of the arm p toengage the heart-cam is, forcing the same and with it the sweepsecondspost 0 and hand cl to the zero position, the friction-caps h and2' allowing the arbor to revolve independent of the gear-wheel g and therest of the movement. At thesametime the spring end q of arm q engagesthe balancewheel arbor s, stopping the watch-movement. By now letting goof button r the levero will fly back by pressure of the spring 2; andlie against the shoulder t of spring 6. The arm 19 will now bedisengaged from the heart-cam,

but the spring end will still be in contact with the balance-wheel arbors to stop the watchmovement and will be in the position shown in Fig. 1.The movement may now be started by pressing the button 0* in theopposite direction of the arrow, overcoming the resistance of the spring2? and pressing the arm of lever 0 by the shoulder t into the notch 23of spring 6. To stop the movement, the button 0' is again pushed back inthe direction of the arrow into the position shown in Fig. 1, so thatthe end of arm 9 of lever 0 engages the balance-wheel arbor s, but thearm p does not engage the heart-cam k.

WVhat I claim is 1. In a stop-watch the combination with a balance-wheelarbor, and a seconds-p0st; a heart-cam rigidly secured to said post; ofa lever consisting of three arms, one of which projects outside of thecase for the purpose of operating said lever, the other two arms beingso relatively placed that one of said arms will engage saidbalance-wheel arbor and thereby stop the movement of same and continueto hold it so during the time that the other arm engages the aforesaidheart-cam on the sweep seconds-post in order to return same to its zeroposition substantially as shown and described.

2. In combination in a watch of the class described, a sweepseconds-post, a gear-wheel revolubly mounted thereon; friction-capsrigidly secured to said sweep seconds-postand bearing upon saidgear-wheel; a heart-cam rigidly secured to said post; a balance-wheelarbor; .and a lever consisting of the arm 1- extending outside of thewatch-case for the purpose of operating same; the arm (1 adapted toengage the said balance-wheel arbor and stop the same during the timethat the arm 7) engages the said heart-cam Z in order to return the sameto its zero position substantially as shown and described.

3. In combination in a watch of the class described. a sweepseconds-post; a heart-cam secured to said post; a balance-wheel arbor; alever 0 having an arm 7) adapted to engage said heart-cam and returnsame to zero position, a second arm 9 with flexible end 1 adapted toengage the said balance-wheel arbor and stop the watch-movement duringthe above operation, and a third arm for operating said lever 0;together with a yielding stop t for the purpose of holding the arms 1*in the different positions substantially as shown and described.

In testimony whereof I have signed my name to this specification in thepresence of two su bscribing witnesses.

JAMES L. N EWELL. itnesses:

WV. J. LAMSON, C. H. STEPHENS.

